Supported anisotropic reverse osmosis membranes based on synthetic polyamides and processes for their preparation
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United States of America Patent
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Oct 28, 1980
Issued Date -
N/A
app pub date -
Oct 16, 1978
filing date -
Jul 30, 1975
priority date (Note) -
Expired
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Abstract
Supported anisotropic reverse osmosis membrane based on synthetic polyamides are prepared by first preparing a support therefor for treating a material suited for serving as a support for a polyamide membrane, with a heat resistant water soluble polymer which is insoluble in the polar solvents to be used for preparing the polyamide solution described below; preparing a solution of the polyamide in an organic polar solvent, in the presence of a saline compound; spreading the thus prepared polyamide solution onto the prepared support; partially evaporating the solvent by heating; coagulating the membrane in an aqueous medium; and optionally, thermally treating the membrane.
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